Jeff has the opportunity to receive​ lump-sum payments either now or in the future. Which of the following opportunities is the​ best, given that the interest rate is ​4% per​ year?

a. one that pays $ 900 now
b. one that pays $ 1080 in two years
c. one that pays $ 1350 in five years
d. one that pays $ 1620 in ten years